Home / 138,512.91-191,129.40-78,086.10

Finding the Fourth Proportional to 138,512.91, 191,129.40 and 78,086.10

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Solution

The fourth proportional to 138,512.91, 191,129.40 and 78,086.10 is: 107,748.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,512.91 : 191,129.40 = 78,086.10 : x
  2. Step 2: Convert to fraction form
    138,512.91/191,129.40 = 78,086.10/x
  3. Step 3: Cross multiply
    138,512.91x = 191,129.40 × 78,086.10
  4. Step 4: Simplify right side
    138,512.91x = 14,924,549,441.34
  5. Step 5: Solve for x
    x = 14,924,549,441.34/138,512.91
  6. Step 6: Final answer
    x = 107,748.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.